"Experientia docet" - Experience is the best teacher
The incidence of foetal dwarfism in shorthorn cattle in the subtropics
Results are reported on the incidence of foetal dwarfism in purebred Shorthorn cattle in the subtropics. One third of the calves born weighed less than 18 kg and half weighed less than 22,75 kg. The weight of dwarfs ranged from…
The effect of castration and vasectomy on male Zebus which grazed veld under two systems of management
Thirty-six animals were used to examine the effect of castration and vasectomy on performance of bulls which grazed veld under two systems of management. During the trial (which lasted from 15th May, 1964 to 28th December, 1966) rates of bodymass…
Die bepaling van spier, vet en been in karkasse en snitte van jong osse
The carcasses of eighteen steers with an average age of 16 months (beef, dairy and crossbred types) were used to determine the part-whole relationships in the composition of cuts and carcasses. The prime rib cut which is a very practical…
Seisoenale veranderinge in chemiese samestelling van volwasse blesbokramme (Damaliscus dorcas phillipsi) van die Van Riebeeck na
Seasonal changes in chemical composition of adult blesbok (Damaliscus dorcas phillips/) males from the Van Riebeeck nature reserve Whole body analyses were carried out on mature blesbok males over the four seasons of the year. A clear seasonal pattern emerged…
Beskrywing van tegnieke en chemiese analises van skaapliggame en foute daaraan verbonde
A description of procedures and associated errors for chemical analyses of whole bodies of sheep. As part of a comparative slaughter experiment, whole bodies of 24 lambs were analyzed for dry matter, nitrogen, ether-extract, ash and energy content. A large…
The influence of dietary protein and energy concentration on the body composition of broiler breeder pullets
In an experiment designed to test the effect of different protein and energy treatments on body mass restriction of broiler breeder pullets, carcass analyses were carried out on these birds at 3 different stages during the growing period. None of…
Genetic parameters for cow weight at calving and at calf weaning in South African Simmental cattle (Short communication)
A study was conducted to compare mature cow weight in the South African Simmental population when defined as the weight of the cow at calving or the weight of the cow at weaning of the calf. Data included in the…
Calving interval genetic parameters and trends for dairy breeds in South Africa
Calving interval (CI) is a fertility trait that can be used in selection programmes to minimize the negative effects that selection for production have on fertility. CI can be derived from milk recording data, therefore this fertility trait can easily…
The conception rate of MAP and MAP-PMSG-treated karakul ewes inseminated with diluted semen
Six groups of 45 Karakul ewes were treated with 40 mg MAP sponges inserted for 15 days. Five of these groups also received 400 IV PMSG on the 13th day. All the ewes were inseminated 12 h after the onset…
Normal values for ionized calcium in the plasma of normal lactating ewes and suckling lambs: Relation to plasma total calcium, i
The mean plasma ionized calcium in 35 normal lactating ewes was 4,25 ±0,49 mg/l00 ml (1,06 ±0,12 mM/l) and in 26 normal single 21-28 day old suckling lambs was 4,47 ±0,65 mg/100 ml (1,12 ± 0,16 Mm/1). On average this…
Estrussinchronisasie by Afrikanerkoeie buite die normale teelseisoen
Oestrus was synchronized outside the normal breeding season in two groups of 25 and 30 dry Africander cows respectively by administration of progesterone in oil + PMS (group I) and progesterone in oil + prostaglandin + PMS (group II). 76,0%…
Die netto energiebenodigdhede van vroeggespeende lammers
Total net energy retention was determined on 27 Dormer X Merino weather lambs by means of the tritiated water space method whilst the digestibility of the nine experimental rations was determined simultaneously. Net energy requirements for maintenance (NEm) and production…
Invloed van die byvoeging van ureum, kalk of biuret tot mieliekuilvoer gesny op twee groeistadia
Effect of adding urea, limestone or biuret to maize silage cut at two stages of maturity: Dry matter digestibility of maize silage ensiled three weeks later than the hard dough stage (42,6 % dry matter) was higher than that of…
Digestibility studies with Prosopis juliflora (mesquite-thorn) pods
Digestibility and voluntary intake trials were undertaken with S.A. Mutton Merino wethers fed a basal diet of milled lucerne and oat hay (control diet) to which various proportions of milled Prosopis juliflora pods were added up to 100% replacement. Ad…
The effects of alternate feeding and fasting on growth and feed utilization by broiler chickens fed diets differing in protein a
An experiment is described in which three diets differing in protein and energy content but having a constant energy:protein ratio, were each fed to three groups of broiler chickens to four weeks of age. The three groups on each diet…
